我一直致力于使用亚马逊 S3 的 REST API 将文件从我的 Android 设备上传到我拥有的存储桶。我有 KEY 和 SECRET_KEY,但不确定如何正确生成他们在请求中寻找的签名值。我在他们的服务器上使用 HttpPut,但不确定如何正确生成 signatureValue。到目前为止,这是我所拥有的:
HttpPut put = new HttpPut(URL);
String fmt = "EEE, dd MMM yyyy HH:mm:ss ";
SimpleDateFormat format = new SimpleDateFormat(fmt, Locale.US);
format.setTimeZone(TimeZone.getTimeZone("GMT"));
String method = "PUT";
String contentType = "application/octet-stream";
String date = format.format(new Date()) + "GMT";
String bucket = "/test-bucket52809/";
StringBuffer buf = new StringBuffer();
buf.append(method).append("\n\n");
buf.append(contentType).append("\n");
buf.append(date).append("\n");
buf.append(bucket);
String signature = percentEncodeRfc3986(hmac(buf.toString()));
然后这里是我用来生成签名值的方法:
private void setupMac() throws UnsupportedEncodingException, NoSuchAlgorithmException, InvalidKeyException
{
byte[] secretyKeyBytes = KEY_SECRET.getBytes("UTF-8");
signingKey = new SecretKeySpec(secretyKeyBytes, "HmacSHA256");
mac = Mac.getInstance("HmacSHA256");
mac.init(signingKey);
}
private String hmac(String stringToSign) {
String signature = null;
byte[] data;
byte[] rawHmac;
try {
data = stringToSign.getBytes("UTF-8");
rawHmac = mac.doFinal(data);
signature = new String(Base64.encode(rawHmac, Base64.DEFAULT));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("UTF-8" + " is unsupported!", e);
}
return signature;
}
private String percentEncodeRfc3986(String s) {
String out;
try {
out = URLEncoder.encode(s, "UTF-8").replace("+", "%20")
.replace("*", "%2A").replace("%7E", "~");
} catch (UnsupportedEncodingException e) {
out = s;
}
return out;
}
我使用了 Amazon S3 签名测试器,我的字符串是正确的,但我从未得到正确的编码值。感谢您向正确方向提供的任何帮助或插入。
最佳答案
import sun.misc.BASE64Encoder;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
String policy = (new BASE64Encoder()).encode(
policy_document.getBytes("UTF-8")).replaceAll("\n","").replaceAll("\r","");
Mac hmac = Mac.getInstance("HmacSHA1");
hmac.init(new SecretKeySpec(
aws_secret_key.getBytes("UTF-8"), "HmacSHA1"));
String signature = (new BASE64Encoder()).encode(
hmac.doFinal(policy.getBytes("UTF-8")))
.replaceAll("\n", "");
[引用:https://aws.amazon.com/articles/1434]
上面的链接也描述了HTTP请求中的输入参数。
关于android - 如何在不使用 SDK 的情况下将文件从 Android 上传到 Amazon S3,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19281215/